Senior Security Engineer (AI Security)

Nu is the leading digital bank in Latin America serving 135 million customers across Brazil Mexico and Colombia. The company has been leading an industry transformation by leveraging data and proprietary technology to develop innovative products and services.

Guided by its mission to fight complexity and empower people Nu caters to customers complete financial journey promoting financial access and advancement with responsible lending and transparency. The company is powered by an efficient and scalable business model that combines low cost to serve with growing returns.

Nus impact has been recognized in multiple awards including Time 100 Most Influential Companies Fast Companys Most Innovative Companies and Forbes Worlds Best Banks.

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About the role

We are looking for a Senior Security Engineer to work closely with our teams to strengthen the security and resilience of our AI this role you will identify and assess security risks across machine learning models and Generative AI applications design and implement security controls and help build security frameworks and tooling for the safe adoption of AI at scale.

You will partner with engineering teams to integrate security throughout the AI development lifecycle automate security assessments and controls and contribute to the continuous evolution of our AI security practices. This role combines hands-on security engineering risk analysis and applied AI security requiring strong technical expertise sound judgment and a proactive mindset to help ensure the secure and responsible use of AI technologies.

Main Responsibilities

• Identify and analyze vulnerabilities providing insights and recommendations for mitigation;

• Contribute to the development and implementation of cutting-edge security frameworks ensuring the responsible and secure usage within our AI ecosystem;

• Work closely with development teams to integrate security measures into the AI development lifecycle;

• Assist in incident response planning specific to AI-related security incidents and participate in simulations to test response effectiveness;

• Develop and integrate tools to automate security assessments and controls;

• Proactively seek knowledge and engage in research and development initiatives to support innovation;

• Raise Nubank awareness towards safe AI usage.

Must Have

• Knowledge of security frameworks such as OWASP;

• Programming skills in languages commonly used in machine learning (e.g. Python);

• Proactive mindset with the ability to analyze complex systems and identify potential security risks;

• Strong communication skills to effectively convey complex security concepts to technical and non-technical stakeholders.

• Hands-on experience with CI/CD pipelines and implementing security tools (e.g. SAST DAST SCA).

• Experience with high scalability environments.

• Experience in zero-trust and regulated environments.

Nice to Have

• Experience with AI frameworks and libraries (e.g. PyTorch TensorFlow);

• Expertise with automation programming languages (e.g. Bash Ansible Go);

• Knowledge of cloud infrastructure technologies (e.g. AWS K8S Terraform);

• Knowledge of Machine Learning and Generative AI concepts and technologies (e.g. HuggingFaces MCP).

Role Location

Hybrid: Belo Horizonte Rio de Janeiro São Paulo Campinas - SP.

Our Benefits

• Chance of earning equity at Nubank

• Food/ Meal Card (Vale-Refeição and/or Vale Alimentação)

• Public Transportation Commuting Benefit (Vale-Transporte)

• NuCare Psychological Financial and Legal Assistance Program

• Life Insurance

• Medical Plan

• Dental Plan

• NuLanguage Language Course Program

• Nucleo - Our learning platform of courses

• Extended Parental Leave

• Daycare Allowance

• Parental Consultancy

• Work-from-home Allowance

• Gym Partnerships

• 30 days of paid vacation

• Relocation Assistance Package if applicable
  
  Work Model for this Role

  Hybrid 2-3 times/week: Our hybrid work model brings us to the office at least twice a week on strategic days designed to maximize team connection and collaboration. For more details visit how we build technology at Nubank:

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Our recruitment process may involve the use of artificial intelligenceenabled tools such as automated interview transcription and analysis to support the evaluation process. Artificial intelligence is not used to make final hiring decisions; all decisions are made by human reviewers.

Required Experience:

Senior IC